text: The Cebeci–Smith model, developed by Tuncer Cebeci and Apollo M. O. Smith in 1967, is a 0-equation eddy viscosity model used in computational fluid dynamics analysis of turbulence in boundary layer flows. The model gives eddy viscosity, , as a function of the local boundary layer velocity profile. The model is suitable for high-speed flows with thin attached boundary layers, typically present in aerospace applications.  Like the Baldwin-Lomax model, it is not suitable for large regions of flow separation and significant curvature or  rotation.  Unlike the Baldwin-Lomax model, this model requires the determination of a boundary layer edge.